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(AMS)

A technique for radiocarbon dating in which a cyclotron is used to measure directly the number of 14C atoms or the proportion of 14C to 12C and 13C atoms in the sample. Results are obtained much more quickly than by alternative methods and can be used on much smaller samples of material.

http://www.physics.purdue.edu/primelab/introduction/ams.html Description and explanation of the technique.